Shen Collection, Lower Volume Radical: Clothing (yī) 褥 Kangxi Strokes: 16 Page 1122, Entry 15 Pronounced ru (falling tone). Refers to a felt mat or mattress. Book of Categories (Leipian) explains it as a cushion. Correct Rhymes (Zhengyun) defines it as a seat cushion or mattress. Explanation of Names (Shiming) explains it as being called ru because it is considered to be a humble or soiled object, as it is something that is easily dirtied by contact with the body when one is sitting or lying down. Commentary on the Book of Odes (Shijing), Odes of Qin (Qin Feng) states that the term yin refers to a cushion used in a carriage. Biography of Wang Chang in the History of the Later Han (Hou Hanshu) states that Wang Chang often wore simple cloth garments and laid out a leather mattress. Also, in Collected Rhymes (Jiyun), pronounced nu (falling tone). Book of Categories (Leipian) refers to infant clothing.